Question regarding minimum payments on credit cards being raised

Has anyone else heard about credit card companies raising the minimum payments from 2% to 4%? Here are a couple articles:

http://www.creditcards.com/credit-card-news/minimum-credit-card-payments-1267.php

https://www.thebalance.com/pay-more-than-the-minimum-961133

I wonder how much truth there is to this and if the credit cards will do this gradually. I’m freaking out over this. If this happens on all of our credit cards – we will have to somehow come up with another $600 a month! We are not incurring any more debt right now and are trying to pay off our cards, but this will not help! Any thoughts?